Mortar for Stone Veneer Walls

I think that I am in the right church here, this is a question for the FAQ forum on masonary. I found the FAQ's quite useful but still have a few questions re a maonary mix for stone veneer walls.
1) Can I use a masonary cement + sand to make my mortar instead of portland, lime & sand.
2) Should I use a bonding agent
3) Masonary cement bags have suggested mixes on the back of the bag for both type 'N' & type 'S' masonary. I understand that Type 'N' in normal & is fine for what I want to do.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.